Yeah, a lot of this information is pretty low-value relative to the Sound On Sound stuff. What good is it to know the difference in how a square wave and triangle wave look, if you don't understand how they sound different and why you might prefer one to the other? The "synth secrets" series is much more technical and showing its age, but it's comprehensive.
It also helps to have a real or soft synth in front of you so you can tweak knobs and play around as you go
If you don't have anything, my recommendation is ZynAddSubFX. It is an amazing free synth with enough knobs to do almost anything
Thank you for the link! :) I've recently gotten a MIDI controller to finally take some first steps into electronic music (I'm used to playing "regualr" keyboard) and this is what I was looking for!